Reading focus
Syllabus: How Do We Learn From Other People?
Track the two ways of measuring information use and how several influences combine in Figures 1 and 2. Keep improved payoff in these tasks distinct from an explanation of evolutionary origins.
Why you’re reading it. Extend selective learning beyond a single trustworthy speaker to the interaction between personal confidence, information quality, and cost.
A question to consider. Would a tendency to follow a majority have the same value when people independently check evidence and when everyone repeats one original source? Explain what additional information you need.
Why this reading
Copying others can depend simultaneously on confidence, costs, and the quality of the available information. This multi-task investigation turns broad claims about useful social learning into predictions about measurable choices and performance.
Before you read
Personal or asocial information comes from engaging with the task directly; social information comes from others’ decisions. A strategy need not be a conscious plan. Here, adaptive refers to improved task performance or payoff, used to investigate predictions from evolutionary theory. It is not a direct measurement of survival or reproduction.
Read for
- Distinguish the sequential protocol, which measures changes after receiving another source, from the choice protocol, which measures selecting social or personal information.
- Use Figures 1 and 2 to track how confidence, consensus, demonstrator number, and costs combine. Separate a fitted contribution of social information from the final behavior produced by all influences.
- Inspect the comparisons linking information use with task success, then distinguish evidence about present behavior from hypotheses about how learning rules evolved or developed.
Consider afterwards
- Five people agree on an answer. What difference would it make if they solved the problem independently rather than all repeating one person, and which assumption behind a benefit of consensus would change?
Editorial context
Four experiments involve 255 adults, nearly all students at one university, using constrained computer tasks. The results provide evidence for conditional use of several kinds of information. They do not identify whether the underlying rules were acquired through experience, inherited, or implemented by a particular cognitive mechanism; the authors leave those questions open. Benefits of a majority depend on the quality and independence of its information. The title’s evolutionary framing should not be mistaken for an experimental manipulation of evolutionary history.